dbus: export load error on unit objects

3 files changed, 65 insertions, 2 deletions

diff --git a/src/dbus-unit.c b/src/dbus-unit.c
index 266fb39be2..bf240f97d4 100644
--- a/src/dbus-unit.c
+++ b/src/dbus-unit.c
@@ -330,6 +330,30 @@ int bus_unit_append_need_daemon_reload(DBusMessageIter *i, const char *property,
         return 0;
 }
 
+int bus_unit_append_load_error(DBusMessageIter *i, const char *property, void *data) {
+        Unit *u = data;
+        const char *name, *message;
+        DBusMessageIter sub;
+
+        assert(i);
+        assert(property);
+        assert(u);
+
+        if (u->meta.load_error != 0) {
+                name = bus_errno_to_dbus(u->meta.load_error);
+                message = strempty(strerror(-u->meta.load_error));
+        } else
+                name = message = "";
+
+        if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub) ||
+            !dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &name) ||
+            !dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &message) ||
+            !dbus_message_iter_close_container(i, &sub))
+                return -ENOMEM;
+
+        return 0;
+}
+
 static DBusHandlerResult bus_unit_message_dispatch(Unit *u, DBusConnection *connection, DBusMessage *message) {
         DBusMessage *reply = NULL;
         Manager *m = u->meta.manager;
diff --git a/src/dbus-unit.h b/src/dbus-unit.h
index df8f6ae2ac..fc9b4f5768 100644
--- a/src/dbus-unit.h
+++ b/src/dbus-unit.h
@@ -113,6 +113,7 @@
         "  <property name=\"ConditionTimestamp\" type=\"t\" access=\"read\"/>\n" \
         "  <property name=\"ConditionTimestampMonotonic\" type=\"t\" access=\"read\"/>\n" \
         "  <property name=\"ConditionResult\" type=\"b\" access=\"read\"/>\n" \
+        "  <property name=\"LoadError\" type=\"(ss)\" access=\"read\"/>\n" \
         " </interface>\n"
 
 #define BUS_UNIT_INTERFACES_LIST                \
@@ -170,7 +171,8 @@
         { "org.freedesktop.systemd1.Unit", "JobTimeoutUSec",       bus_property_append_usec,       "t",    &u->meta.job_timeout              }, \
         { "org.freedesktop.systemd1.Unit", "ConditionTimestamp",   bus_property_append_usec,       "t",    &u->meta.condition_timestamp.realtime }, \
         { "org.freedesktop.systemd1.Unit", "ConditionTimestampMonotonic", bus_property_append_usec,"t",    &u->meta.condition_timestamp.monotonic }, \
-        { "org.freedesktop.systemd1.Unit", "ConditionResult",      bus_property_append_bool,       "b",    &u->meta.condition_result         }
+        { "org.freedesktop.systemd1.Unit", "ConditionResult",      bus_property_append_bool,       "b",    &u->meta.condition_result         }, \
+        { "org.freedesktop.systemd1.Unit", "LoadError",            bus_unit_append_load_error,     "(ss)", u                                 }
 
 int bus_unit_append_names(DBusMessageIter *i, const char *property, void *data);
 int bus_unit_append_following(DBusMessageIter *i, const char *property, void *data);
@@ -187,6 +189,7 @@ int bus_unit_append_job(DBusMessageIter *i, const char *property, void *data);
 int bus_unit_append_default_cgroup(DBusMessageIter *i, const char *property, void *data);
 int bus_unit_append_cgroups(DBusMessageIter *i, const char *property, void *data);
 int bus_unit_append_need_daemon_reload(DBusMessageIter *i, const char *property, void *data);
+int bus_unit_append_load_error(DBusMessageIter *i, const char *property, void *data);
 
 void bus_unit_send_change_signal(Unit *u);
 void bus_unit_send_removed_signal(Unit *u);
diff --git a/src/systemctl.c b/src/systemctl.c
index bf905caa31..3eb8ab5b5c 100644
--- a/src/systemctl.c
+++ b/src/systemctl.c
@@ -1969,6 +1969,8 @@ typedef struct UnitStatusInfo {
         const char *path;
         const char *default_control_group;
 
+        const char *load_error;
+
         usec_t inactive_exit_timestamp;
         usec_t active_enter_timestamp;
         usec_t active_exit_timestamp;
@@ -2039,7 +2041,9 @@ static void print_status_info(UnitStatusInfo *i) {
         } else
                 on = off = "";
 
-        if (i->path)
+        if (i->load_error)
+                printf("\t  Loaded: %s%s%s (Reason: %s)\n", on, strna(i->load_state), off, i->load_error);
+        else if (i->path)
                 printf("\t  Loaded: %s%s%s (%s)\n", on, strna(i->load_state), off, i->path);
         else
                 printf("\t  Loaded: %s%s%s\n", on, strna(i->load_state), off);
@@ -2392,6 +2396,30 @@ static int status_property(const char *name, DBusMessageIter *iter, UnitStatusIn
 
                 break;
         }
+
+        case DBUS_TYPE_STRUCT: {
+
+                if (streq(name, "LoadError")) {
+                        DBusMessageIter sub;
+                        const char *n, *message;
+                        int r;
+
+                        dbus_message_iter_recurse(iter, &sub);
+
+                        r = bus_iter_get_basic_and_next(&sub, DBUS_TYPE_STRING, &n, true);
+                        if (r < 0)
+                                return r;
+
+                        r = bus_iter_get_basic_and_next(&sub, DBUS_TYPE_STRING, &message, false);
+                        if (r < 0)
+                                return r;
+
+                        if (!isempty(message))
+                                i->load_error = message;
+                }
+
+                break;
+        }
         }
 
         return 0;
@@ -2433,6 +2461,14 @@ static int print_property(const char *name, DBusMessageIter *iter) {
                                 printf("%s=%s\n", name, s);
 
                         return 0;
+                } else if (dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_STRING && streq(name, "LoadError")) {
+                        const char *a = NULL, *b = NULL;
+
+                        if (bus_iter_get_basic_and_next(&sub, DBUS_TYPE_STRING, &a, true) > 0)
+                                bus_iter_get_basic_and_next(&sub, DBUS_TYPE_STRING, &b, false);
+
+                        if (arg_all || !isempty(a) || !isempty(b))
+                                printf("%s=%s \"%s\"\n", name, strempty(a), strempty(b));
                 }
 
                 break;